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Cuspal deflection in class V cavities restored with composite resins
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Jun-Gyu Park, Bum-Soon Lim, In-Bog Lee
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J Korean Acad Conserv Dent 2008;33(2):83-89. Published online March 31, 2008
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DOI: https://doi.org/10.5395/JKACD.2008.33.2.083
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Abstract
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The purpose of this study was to evaluate the effect of the polymerization shrinkage and modulus of elasticity of composites on the cusp deflection of class V restoration in premolars. The sixteen extracted upper premolars were divided into 2 groups with similar size. The amounts of cuspal deflection were measured in Class V cavities restored with a flowable composite (Filtek flow) or a universal hybrid composite (Z-250). The bonded interfaces of the sectioned specimens were observed using a scanning electron microscopy (SEM). The polymerization shrinkage and modulus of elasticity of the composites were measured to find out the effect of physical properties of composite resins on the cuspal deflection. The results were as follows.
The amounts of cuspal deflection restored with Filtek flow or Z-250 were 2.18 ± 0.92 µm and 2.95 ± 1.13 µm, respectively. Filtek flow showed less cuspal deflection but there was no statistically significant difference (p > 0.05).
The two specimens in each group showed gap at the inner portion of the cavity.
The polymerization shrinkages of Filtek flow and Z-250 were 4.41% and 2.23% respectively, and the flexural modulus of elasticity of cured Filtek flow (7.77 GPa) was much lower than that of Z-250 (17.43 GPa).
The cuspal deflection depends not only on the polymerization shrinkage but also on the modulus of elasticity of composites.
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Citations
Citations to this article as recorded by 
- Comparison of marginal microleakage between low and high flowable resins in class V cavity
Sang-Bae Bae, Young-Gon Cho, Myeong-Seon Lee Journal of Korean Academy of Conservative Dentistry.2009; 34(6): 477. CrossRef - A survey on the use of composite resin in Class II restoration in Korea
Dong-Ho Shin, Se-Eun Park, In-Seok Yang, Juhea Chang, In-Bog Lee, Byeong-Hoon Cho, Ho-Hyun Son Journal of Korean Academy of Conservative Dentistry.2009; 34(2): 87. CrossRef - Effect of instrument compliance on the polymerization shrinkage stress measurements of dental resin composites
Deog-Gyu Seo, Sun-Hong Min, In-Bog Lee Journal of Korean Academy of Conservative Dentistry.2009; 34(2): 145. CrossRef - The change of the initial dynamic visco-elastic modulus of composite resins during light polymerization
Min-Ho Kim, In-Bog Lee Journal of Korean Academy of Conservative Dentistry.2009; 34(5): 450. CrossRef
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